Ugh, you guys disappoint me.
is not a hacker, he's a random weirdo who found out people allow join requests to cofounders, and join requests are automatically approved by people clicking yes over and over and don't realize he's applying for cofounder, then he just went in and messed with stuff. Elaborate hacker my ass.
If he is a troll, you can go congratulate him. You made him succeed. It is this overreation that made it successful. Blocking all join requests and other extreme measures are uncalled for and stupid. Just check where you allow people to request to join! Seriously, it's not that hard. Make sure you have strong passwords and make sure your moderators know what they're doing.
I'm tired of this crap. Seriously guys, chill the heck out.